Cartesian velocity and generalized velocity

[beowulf.geata]

Hi,

I'm reading A Student's Guide to Lagrangians and Hamiltonians by Patrick Hamill and, in the following section on generalized velocity, I'm wondering if we should have $\delta_{kj}$ rather than $\delta_{ij}$?

Many thanks.

 

[PeroK]

Hi,

I'm reading A Student's Guide to Lagrangians and Hamiltonians by Patrick Hamill and, in the following section on generalized velocity, I'm wondering if we should have $\delta_{kj}$ rather than $\delta_{ij}$?

Looks like it.

 

[beowulf.geata]

Looks like it.

Many thanks!